U.S. Air Force Staff Sgt. Lentrell Hill, a radio frequency transmission technician with the 202nd Engineering Installation Squadron (EIS), Georgia Air National Guard, repels from a tower during a tower climbing and rescue training exercise being conducted during the unit’s annual training at Robins Air Force Base, Ga., June 10, 2015. The 202nd EIS’s enlisted and officer engineers, draftsmen, cable and electronics professionals design and install communications infrastructures. Some of their duties include building antennas, towers, fiber optics, and surveillance equipment, to access control and intrusion detection systems anywhere in the world. (U.S. Air National Guard photo by Senior Master Sgt. Roger Parsons/Released)